Laura Quinn (Demi Moore), a bright, driven and beautiful executive at the London Diamond Corporation finds herself frustrated by a glass ceiling after years of faithful employment, as man after man is promoted ahead of her despite her greater experience. Hobbs (Michael Caine), the nighttime janitor at London Diamond, is virtually invisible to the executives that work there, but over the years has amassed a startling amount of knowledge about how the company runs. Hobbs has his own bone to pick with London Diamond. Observing Laura's frustration, he convinces her to help him execute an ingenious plan to steal a hefty sum in diamonds. But unbeknownst to Laura, Hobbs plans go even farther than he's let on, and together they set in motion a thrilling heist of dizzying proportions, the likes of which London has never seen.